On behalf of the
Registrant and pursuant to Rule 497 under the Securities Act of 1933, as amended, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the 497 filing,
dated July 1, 2013 to the prospectuses for the iShares Enhanced U.S. Large-Cap ETF and iShares Enhanced U.S. Small-Cap ETF. The purpose of this filing is to submit the 497 dated July 1, 2013 in XBRL.

If you have any questions regarding this filing, please contact Benjamin Haskin of Willkie Farr & Gallagher LLP at (202) 303-1124 or me at
(415) 670-7987.